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3 cards from this section. Quick, good the night before a test.
What is the hypotenuse of a right triangle with sides 3 and 4?
Use the Pythagorean theorem.
If sin(30°) = 0.5, what is 1 + tan²(30°)?
Find tan(30°) and apply the identity.
What is the result of sin²θ + cos²θ?
Think about the relationship established by the Pythagorean theorem.
Is 1 + tan²θ = sec²θ a valid trigonometric identity?
Recall the definitions of trigonometric ratios.
Prove that sec²(θ) - 1 = tan²(θ) using trigonometric identities.
Move the 1 to the other side.
If sin(θ) = 12/13, find the values of cos(θ), tan(θ), sec(θ), csc(θ), and cot(θ) using identities.
Use sin²(θ) + cos²(θ) = 1 for finding cos.
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